如何使用wp8.1的FileSavePicker复制.png

Question

如何使用FileSavePicker从appdata:/assets/ *.png复制图像。我发现这个例子是File Save Picker - Save Edited Image (C# Metro app)的，但是它不工作。

我有这样的代码：

private async void OpenButton_Click(object sender, RoutedEventArgs e)
    {

        string path = @"\Assets\Logo.png";
        StorageFolder folder = Windows.ApplicationModel.Package.Current.InstalledLocation;
        StorageFile file = await folder.GetFileAsync(path);

        // Show the picker
        FileSavePicker savePicker = new FileSavePicker();
        // Set the file that will be saved
        savePicker.SuggestedSaveFile = file;
        savePicker.SuggestedFileName = "Logo";
        savePicker.FileTypeChoices.Add("PNG", new List<string>() { ".png" });
        savePicker.PickSaveFileAndContinue();



    }

但他将文件保存为0字节

Answer 1

你试过msdn上的样品了吗？你找到的那一个哪里出了问题？

FileSavePicker savePicker = new FileSavePicker();
savePicker.SuggestedStartLocation = PickerLocationId.DocumentsLibrary;
// Dropdown of file types the user can save the file as
savePicker.FileTypeChoices.Add("Plain Text", new List<string>() { ".txt" });
// Default file name if the user does not type one in or select a file to replace
savePicker.SuggestedFileName = "New Document";

来源：

• Reference from MSDN
• Save image in windows phone 8.1 using FileSavePicker